Here is how we do it at Florea Cakes:
In my wedding cake menu, I have 12 flavors and I ask couples to choose any 6 to try. Yes, I charge for my samples, $50 USD and I offer to give them that as a discount when they book their wedding cake.
So.. I needed to find a way to make this process efficient and easily repeatable, because for high-end cakes, I don’t do testing every single week and, sometimes I only have two days to prepare.
I bake my cakes in half-sheet pans, cut mini square layers, and freeze them. So I have all my layers prepared in advance and safely stored in the freezer for up to 3 months. The day before, I make my faux Swiss meringue buttercream, flavor it, and assemble plastic dessert cups.
I made a video on Instagram about how to put together a tasting kit: